Remove the iOS QR Code scanner experiment code.

ios/chrome/app/application_delegate/user_activity_handler.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/app/application_delegate/user_activity_handler.h"
 
 #import <CoreSpotlight/CoreSpotlight.h>
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
@@ skipping 263 matching lines @@
     return YES;
 
   } else if ([shortcutItem.type isEqualToString:kShortcutVoiceSearch]) {
     base::RecordAction(
         UserMetricsAction("ApplicationShortcut.VoiceSearchPressed"));
     [startupParams setLaunchVoiceSearch:YES];
     [startupInformation setStartupParameters:startupParams];
     return YES;
 
   } else if ([shortcutItem.type isEqualToString:kShortcutQRScanner]) {
-    if (experimental_flags::IsQRCodeReaderEnabled()) {
-      base::RecordAction(
-          UserMetricsAction("ApplicationShortcut.ScanQRCodePressed"));
-      [startupParams setLaunchQRScanner:YES];
-    }
+    base::RecordAction(
+        UserMetricsAction("ApplicationShortcut.ScanQRCodePressed"));
+    [startupParams setLaunchQRScanner:YES];
     [startupInformation setStartupParameters:startupParams];
     return YES;
   }
 
   NOTREACHED();
   return NO;
 }
 
 + (void)routeU2FURL:(const GURL&)URL
     browserViewInformation:(id<BrowserViewInformation>)browserViewInformation {
@@ skipping 13 matching lines @@
     for (Tab* tab in tabModel) {
       if ([tab.tabId isEqualToString:tabID]) {
         [tab evaluateU2FResultFromURL:URL];
         return;
       }
     }
   }
 }
 
 @end